Laser-induced acoustic emissions in experimental dental composites

A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75% ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5 vol% of 8-μm silanized and unsilanized B...

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Veröffentlicht in:Biomaterials 2000-07, Vol.21 (13), p.1399-1408
Hauptverfasser: Lee, Sheng-Yang, Lin, Che-Tong, Keh, En-Sheng, Pan, Li-Chern, Huang, Haw-Ming, Shih, Yung-Hsun, Cheng, Hsin-Chung
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container_end_page 1408
container_issue 13
container_start_page 1399
container_title Biomaterials
container_volume 21
creator Lee, Sheng-Yang
Lin, Che-Tong
Keh, En-Sheng
Pan, Li-Chern
Huang, Haw-Ming
Shih, Yung-Hsun
Cheng, Hsin-Chung
description A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75% ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5 vol% of 8-μm silanized and unsilanized BaSiO 6 were analyzed. The sample size was 4.65 mm (diameter)×0.5 mm (thick). Aging effects of immersing in 75% ethanol for up to 14 h on AEs were then evaluated. A continuous-wave CO 2 laser was used to heat the samples. Acoustic emissions were collected as a function of filler fraction, laser power, silanization, and immersion time. Onset of burst-pattern acoustic signals characteristic of fracturing occurred at different laser powers for different tested groups. Acoustic emissions generally increased with laser power, in which lower laser powers produced low-amplitude (45–50 dB) signals; the amplitude distribution (50–85 dB) became more extensive as laser powers increased. After immersion, the lower laser powers could produce the same phenomenon. The higher the filler fraction, the fewer AEs generated. A large percentage AE reduction due to silanization was noted as a function of filler fraction. Unsilanized specimens showed more thermal damages than did silanized ones.
doi_str_mv 10.1016/S0142-9612(00)00043-0
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subjects Acoustic emissions
Acoustics
Barium compounds
Barium Compounds - chemistry
Biological and medical sciences
Carbon dioxide lasers
Composite Resins - chemistry
Continuous wave lasers
Dental composites
Equipment Design
Ethanol - pharmacology
Hot Temperature
Immersion
Laser
Laser beam effects
Lasers
Materials Testing - instrumentation
Materials Testing - methods
Medical sciences
Microspheres
Plastics fillers
Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)
Reinforced plastics
Silanization
Silicates - chemistry
Technology. Biomaterials. Equipments. Material. Instrumentation
title Laser-induced acoustic emissions in experimental dental composites
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